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kimberlite deposits

  • Diamond Geology

    Diamantiferous kimberlite lamproite pipes are the « Primary deposits » Rough diamonds are transported to the surface of the earth by the magma pushing upwards the kimberlite (diamond bearing rock ) at great velocity

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  • EXPLORATION: The odds of finding diamonds in Ontario ,

    The Victor kimberlite is covered by a minimum of 6 m of glacial and marine Holocene deposits The pipes were emplaced into 275 m of Paleozoic sediments, which overlie Archean basement There is evidence to suggest that the pipes have been significantly eroded

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  • Kimberlite | rock | Britannica

    Kimberlite: Kimberlite, a dark-coloured, heavy, often altered and brecciated (fragmented), intrusive igneous rock that contains diamonds in its rock matrix It has a porphyritic texture, with large, often rounded crystals (phenocrysts) surrounded by a fine-grained matrix (groundmass) It is a mica peridotite.

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  • Kimberlite Pipes: What They Are and How They're Formed ,

    Kimberlite pipes: How they form As mentioned, kimberlite pipes are believed to have been formed by deep-source volcanic eruptions Jeffrey Post, a diamond expert at the Smithsonian, has described .

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  • A Methodology for Geometric Modeling of Kimberlite ,

    306-1 A Methodology for Geometric Modeling of Kimberlite Deposits with Uncertainty Jeff Boisvert1, Peter Oshust2, and Clayton V Deutsch1 1Centre for Computational Geostatistics

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  • Buffalo Head Hills kimberlite field - Wikipedia

    The Buffalo Head Hills kimberlite field is a group of kimberlitic volcanic pipes or diatremes in north-central Alberta, Canada As of 2011, 41 kimberlite pipes, of which 28 are diamondiferous, had been identified in the field They were emplaced during Late Cretaceous to early Paleocene time

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  • CANADIAN KIMBERLITES: GEOLOGICAL CHARACTERISTICS ,

    material as extra-crater deposits which do not resediment back into the pipe The xenolith-poor PKs in pipe types (A) The xenolith-poor PKs in pipe types (A) and (B) are broadly similar and are probably the product of subsequent magmatic eruptions with variable explosivity

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  • 50 Years of Kimberlite Geophysics, A Review - dmecca

    Figure 2: Airborne magnetic survey from 1954 over the Koffiefontein kimberlite pipe, South Africa, after Gerryts, 1970 Note that d ifferent elements of the kimberlite cluster have different magnetic response

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  • Kimberlite Diatremes | Colorado Geological Survey

    Kimberlite Diatremes If diamonds are formed at depths of 150 to 200 kilometers in the upper mantle, how do they get to the surface of the earth? They are brought to the surface in a peculiar igneous rock called kimberlite (named after the diamond-bearing region of Kimberly, South Africa where these rocks were first identified)

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  • Emplacement temperatures of pyroclastic and volcaniclastic ,

    Abstract Palaeomagnetic techniques for estimating the emplacement temperatures of volcanic deposits have been applied to pyroclastic and volcaniclastic deposits in kimberlite pipes in southern Africa

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  • Kimberlite Diamond Deposits Found in Chivi, Zimbabwe | The ,

    Kimberlite diamond deposits have been discovered in the Sese area of Chivi, with investors scrambling to start mining the gems that are expected to catapult Masvingo Province into a mining hub, reports Zimbabwe news outlet The Herald

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  • AN OVERVIEW OF THE ESTIMATION OF KIMBERLITE DIAMOND ,

    The estimation of kimberlite diamond deposits has a number of unique components resulting from the discrete nature of the diamond distribution It is fundamentally important to understand

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  • ILLUSTRATIONS - michigangov

    All were found in Pleistocene glacial deposits or Holocene river gravel The bedrock kimberlite source for the diamonds is unknown but has been presumed to be in northern Canada, the only area north of Wisconsin previously known to contain kimberlit Recently, a kimberlite pipe, here named the Lake Ellen kimberlite, has been found in Iron County, Michigan That find suggests the possibility .

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  • Prospector's Guide to Diamonds - Diamond Prospecting

    Archons (Archean basement created >25 Ga ago) are considered to have high potential for discovery of commercial diamond deposits hosted by kimberlite and possibly by lamproite and lamprophyre The fabulously rich diamond deposits at Ekati and Baffin Bay in Canada occur in kimberlites hosted by a thick Archean craton

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  • Kimberlite Pipe Models: Significance for Exploration

    Current exploration models for kimberlite-hosted diamond deposits are undergoing significant revisions as a consequence of recent discoveries in Canada, and a re-assessment of southern African kimberlit According to Hodgson (1987) "An ore deposit ,

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  • DIAMONDS AND ASSOCIATED HEAVY MINERALS IN KIMBERLITE,

    1236 Chapter 46: Diamonds and Associated Heavy Minerals in Kimberlite Mantle-derived minerals sampled and brought to surface by kimberlite (and other similar rock types) are typically referred to as kimberlitic indicator minerals

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  • Recent Advances in Understanding the Geology of Diamonds ,

    One very successful method for locating diamondiferous kimberlites employs a search in surficial deposits for actual fragments of the kimberlite, or for grain-sized indicator minerals weathered from these fragments (figure 16) These grains survive erosion, and their presence in sediments and soils is a predictor of whether a nearby kimberlite might contain diamonds Indicator minerals range .

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  • Guide for Drift Prospecting for Diamonds

    Dispersal of kimberlite and related heavy minerals from the Buffonta kimberlite dike, Kirkland Lake , 41 28 Fluvial dispersal of kimberlite indicator minerals from the area of the Jack kimberlite,

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  • Carbon and Kimberlite | HowStuffWorks

    Kimberlite is a bluish rock that diamond miners look for when seeking out new diamond deposits The surface area of diamond-bearing kimberlite pipes ranges from 2 to 146 hectares (5 to 361 acres) The surface area of diamond-bearing kimberlite pipes ranges from 2 to 146 hectares (5 to 361 acres)

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  • How We Find Diamond Sources: Kimberlite and Lamproite ,

    This means that total kimberlite occurrences are tens of thousands of hectares of land-mass, compared to 13 billion hectares of land on the planet, of which 7% is located within Archean cratons Given that less than 1% of kimberlites will yield an economically-viable diamond deposit, finding a viable diamond mine is a daunting task Finding the proverbial needle in a haystack is probably much .

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  • Types of Ore Deposits | Sanuja Senanayake

    Notes: Not all ore deposits will contain secondary minerals The epigenetic (different times) and syngenetic (at the same time) is based on the time frame for the formation of the host rock and the ore

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  • Geology Dictionary - Kerogen, Kimberlite, Kilobar

    Many diamond deposits are found in kimberlite pip Dictionary of Geological Terms - Only $1895 All scientific disciplines have an essential vocabulary that students and professionals must understand to learn and communicate effectively

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  • Kimberlite: Mineral information, data and localiti

    It is the principal primary host for diamonds, but only a small percentage of the known kimberlite occurrences are diamondiferous A polymict ultramafic-rich volcanic breccia, dominated by olivine, phlogopite, and diopside +/- garnet, commonly highly serpentinized, porphyritic, and brecciated, which occurs in vertical pipes, dikes, and sills It is the principal primary host for diamonds, but .

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  • Geology Dictionary - Kerogen, Kimberlite, Kilobar

    Many diamond deposits are found in kimberlite pip Dictionary of Geological Terms - Only $1895 All scientific disciplines have an essential vocabulary that students and professionals must understand to learn and communicate effectively

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